The destinations window shows SL-selected locations of interest, ordered by category. Several categories are available. If you find one of interest, click it to see the locations listed there.
Scroll the list of locations; if you leave your mouse over one for a moment, an information panel opens to one side of it. If a location interests you, click it; you will be teleported the immediately.
For more information on the destination guide, and how to get listed, refer to About the Second Life Destination Guide (SL Wiki).